Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20999#discussion_r223913441
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
@@ -521,35 +521,114 @@ case class AlterTableRenamePartitionCommand(
*/
case class AlterTableDropPartitionCommand(
--- End diff --
But it's also weird to use `AttributeReference` this way. Can we create a
new `Attribute` implementation for this purpose? Basically we only need a
resolved expression to hold the partition column name. The type doesn't matter.
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